linux-kernel - Re: [PATCH v7 4/9] crypto: caam - drop global context pointer and init

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Date:   Tue, 11 Feb 2020 20:57:00 +0000
From:   Horia Geanta <horia.geanta@....com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>
CC:     Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Iuliana Prodan <iuliana.prodan@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH v7 4/9] crypto: caam - drop global context pointer and
 init_done

On 1/27/2020 6:57 PM, Andrey Smirnov wrote:
> @@ -70,6 +70,7 @@ struct buf_data {
>  
>  /* rng per-device context */
>  struct caam_rng_ctx {
> +	struct hwrng rng;
>  	struct device *jrdev;
>  	dma_addr_t sh_desc_dma;
>  	u32 sh_desc[DESC_RNG_LEN];
> @@ -78,13 +79,10 @@ struct caam_rng_ctx {
>  	struct buf_data bufs[2];
>  };
>  
> -static struct caam_rng_ctx *rng_ctx;
> -
> -/*
> - * Variable used to avoid double free of resources in case
> - * algorithm registration was unsuccessful
> - */
> -static bool init_done;
> +static struct caam_rng_ctx *to_caam_rng_ctx(struct hwrng *r)
> +{
> +	return container_of(r, struct caam_rng_ctx, rng);
> +}
[...]
> -static struct hwrng caam_rng = {
> -	.name		= "rng-caam",
> -	.init           = caam_init,
> -	.cleanup	= caam_cleanup,
> -	.read		= caam_read,
> -};
[...]> +	ctx->rng.name    = "rng-caam";
> +	ctx->rng.init    = caam_init;
> +	ctx->rng.cleanup = caam_cleanup;
> +	ctx->rng.read    = caam_read;
An alternative (probably better) for storing caamrng context
is to use what is already available in struct hwrng:
 * @priv:               Private data, for use by the RNG driver.

Horia